Garmin GPSMAP 64st, TOPO Canada with High-Sensitivity GPS and GLONASS Receiver Sunlight-Readable 2.6" color display Expanded Internal Memory 8GB DUAL BATTERY SYSTEM Use with 2 traditional AA batteries, or the optional rechargeable NiMH battery pack that can be charged while inside the device.Weight 8.1 oz (230 g) with batteries Receive Smart Notifications* and pair with optional ANT+ sensors, such as heart rate monitor, Tempe temperature sensor, speed/cadence, or use to control your VIRB action camera (64s/64st only) Wirelessly upload data to Garmin Connect and view on smartphone, plus share activities as they happen with Live Track (64s/64st only)